Foreword
There are two kinds of pianists.
There are some pianists who play, not because they enjoy it, but because their parents force them to take lessons. Then there are those who play the piano because it pleases them to create music. They don’t need to be forced; on the contrary, they sometimes don’t know when to stop.
Of the latter kind, there are some who play the piano as a hobby. Then there are those who play for a living. That requires a higher level of dedication, skill, and talent. They may have some degree of freedom about what genre of music they play and the stylistic choices they make in playing it, but fundamentally those choices are driven by the needs of the employer or the tastes of the audience.
Of the latter kind, there are some who do it primarily for the money. Then there are those professionals who would want to play the piano in public even if they weren’t being paid. They enjoy using their skills and talents to make music for others. That they can have fun and get paid for it is so much the better.
Of the latter kind, there are some who are self-taught, who play by ear, who might have great talent and ability, but can’t communicate that intuitive understanding to others except through the music itself. Then there are those who have formal training in both theory and practice. They can explain what techniques the composer used to achieve the intended emotional effect, and use that knowledge to shape their interpretation of the piece.